ANTIOCH — A 22-month-old baby boy fell from a third-story window of an Antioch apartment building Sunday but does not appear to have life-threatening injuries.

Contra Costa firefighters responded to the 600 block of Wilbur Avenue shortly before noon and found a baby had fallen onto concrete and a bed of rocks.

"He was alert, and he was crying," Contra Costa Fire Lt. Charles Thomas said. "With a baby, you can't tell if they're crying because they're afraid or in pain, so we took the necessary precautions."

Officials transported the baby to Children's Hospital Oakland. He has an abrasion on his abdomen, a bump on his head and a bruised lung, Thomas said. Hospital staff are optimistic about the baby's condition, he said. He did not appear to have major injuries, said Antioch police Lt. Scott Willerford, and the hospital is keeping the child for observation.

The baby's mother was in the kitchen at the time the child fell, Willerford said. He appeared to have climbed onto a table near an open window and pushed against the window screen. The fall does not seem to be the result of any neglect, police say.

In addition to being careful about having climbable furniture near windows, Willerford said, parents can buy locking mechanisms for their windows that allow the window to open about 6 inches.